Stock-Based Compensation - Relevant Data Used to Determine the Value of Stock Options Granted During the Period (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2018	Apr. 01, 2017
Options Issued and Significant Assumptions Used to Estimate Option Fair Values
Options issued	133
Weighted-Average Exercise Price and Fair Value of Options on the Date of Grant
Weighted-average exercise price of options granted	$ 206.66
Equity Option [Member]
Options Issued and Significant Assumptions Used to Estimate Option Fair Values
Options issued	133	207
Fair value assumptions, risk free interest rate	2.70%	2.20%
Fair value assumptions, expected life in years	6 years	6 years
Fair value assumptions, expected volatility	23.20%	23.20%
Fair value assumptions, expected dividends	$ 0	$ 0
Weighted-Average Exercise Price and Fair Value of Options on the Date of Grant
Weighted-average exercise price of options granted	$ 206.66	$ 149.74
Weighted-average grant date fair value of options granted	$ 58.38	$ 40.39

No definition available.

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- Definition

The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Weighted average expected volatility rate of share-based compensation awards.

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- Definition

Gross number of share options (or share units) granted during the period.

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No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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